Heinkel 111 H-3 photographed in flight from adjacent aeroplane.  This photo is attributed "circa 1940" - which is probably accurate, although some details might suggest a slightly later date.  Apart from full subtypes, the H-3 subtype had a number of slightly differing sub-sub types, making it difficult to be certain.  

Originally developed as a military aircraft under cover of a civilian airliner programme, the He 111 was the "workhorse" medium bomber of the Luftwaffe, affording a better "menu" of survivability, bomb-load and range than other German types, notwithstanding the fact that the Junkers Ju-88 outclassed it in particular respects.  The He-111 was particularly important in the Polish and Western campaigns, through to the Battle of Britain and the subsequent "Blitz" against British cities.  One wonders, however, whether crewmembers in the "nose" always appreciated the innovative high-vision design which, while it had obvious advantages, must have left them feeling very exposed.  Best regards, JR.

High transparency - Heinkel 111.

View of a flying German bomber Heinkel He-111 from the cockpit of another He-111.

Flying Heinkel He-111

Luftwaffe aircraft fly in triple-chevron formation during a political demonstration, 1937.  What sort of aircraft is difficult to ascertain at this resolution.  However, close examination makes it clear that these are fixed-undercarriage biplanes.  Furthermore, the shape of the tail fin strongly suggests that these are Gotha Go-145s.  While obsolete for any purposes by the time of its first production, the Go-145 was one of the first aircraft to enter Luftwaffe service, and was produced in substantial numbers.  The primary reason for this seems to have been because the Go-145 was a well-tried format, easy and cheap to produce and, therefore, useful for presentation purposes at demonstrations like this.  It had the useful (indeed, very important) function as a powered-flight trainer, and also functioned during the war as a "nuisance" bomber, conducting "nuisance" raids on Soviet forces almost to the end.  As a result, this museum piece ended up as the Luftwaffe's longest-serving aircraft, by some way.  Best regards, JR.